What riveting methods are there for sheet metal?

The most common is pop riveting, where you insert a rivet into a punched hole with a tool and the rivet is deformed on the back. You can also use Henrob-rivet, whereby a machine makes the hole and at the same time pushes in the rivet so that it remains. Crank riveting is another variant, in which two materials are pressed together and a rivet is formed from the materials without the formation of holes.